According to the CiviCRM wiki here, under "Functional Separation in Multisite", mailings are listed as separated by domain. However, when my users access the "Scheduled and Sent Mailings", they see mailings from all domains. I know that civicrm_mailing has a field domain_id. Is there something I need to do to enforce this separation? Or am I just misreading the wiki?
This is a bug. Please log an issue on https://issues.civicrm.org.
I've since fixed this bug, with funding from Healthcare-NOW and significant assistance from the dev team at the Autralian Green Party: https://issues.civicrm.org/jira/browse/CRM-16981